package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    //因为SubjectExcelListener不能交给spring进行管理，需要自己new，不能注入其他对象
    //不能实现数据库操作
    public EduSubjectService subjectService;


    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    public SubjectExcelListener() {
    }
    //读取excel内容，一行一行进行读取
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
     if (subjectData==null){
         throw  new GuliException(20001,"文件数据为空");
     }
     //一行一行读取，每次读取有两个值，第一个值一级分类，第二个值二级分类
     //判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
     if (existOneSubject==null){//没有相同的一级分类，进行添加
         existOneSubject=new EduSubject();
         existOneSubject.setParentId("0");
         existOneSubject.setTitle(subjectData.getOneSubjectName());//一级分类名称
       subjectService.save(existOneSubject);
     }
     //获取一级分类的id值
        String pid=existOneSubject.getId();
     //添加二级分类
//        判断二级分类是否重复
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
        if (existTwoSubject==null){
            existTwoSubject=new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());//一级分类名称
            subjectService.save(existTwoSubject);
        }
    }


//    判断一级分类不能重复添加
      private EduSubject existOneSubject(EduSubjectService subjectService,String name){
          QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
          wrapper.eq("title",name);
          wrapper.eq("parent_id","0");
          EduSubject oneSubject = subjectService.getOne(wrapper);
          return oneSubject;
      }

    //判断二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService subjectService,String name,String pid){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
